A few pictures of the towers I built for a friend a few years back. They've since been set on granite bases. No more wood blocks. Built while I still had access to a full woodshop.
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That ply looks absolutely fantastic! How much does it cost, compared to something like 18mm birch ply or MDF? Where on earth would I get that in the UK I wonder...

That ply looks absolutely fantastic! How much does it cost, compared to something like 18mm birch ply or MDF? Where on earth would I get that in the UK I wonder...

That (sure looks like) Plyboo Neopolitan stranded bamboo plywood. We used a sheet of it to build a number of miniOnken. Comes in 4'x6' sheets and ends up running close to 4x the price of the quality ply we use. Very dense and heavy, shipping from the US could come close to the purchase price.

As the name might imply, these speakers were the result of a late night at MIT. I designed them in HornResp in about an hour. They are OD-MLTLs, tuned to bottom out around 50hz.

The drivers are Fostex FE166ES-Rs that I have had laying around for a while. They have VERY limited xmax, so the enclosure was designed to be a compromise between depth extension and excursion, keeping in mind that the listening volume is not going to be very high.

The material is cheap plywood (with voids lol) left over from the fort that was built for orientation. I didn't have access to a table saw, and didn't want to wait to use the waterjet, so I just freehanded everything on a circular saw. A good amount of glue was used to seal up various gaps.

These are basically studies in what happens when you take a pretty good design and excellent speakers and then throw all other 'good build principles' to the wind.

The result is surprisingly good. There is obviously some coloration in the 200-500hz range, but the high end and bass is really quite nice. There is a definite soundstage, and they are very listenable.

I plan to build a 2ft^3 sealed subwoofer to hang on the wall behind these things, and I will waterjet that enclosure so it will be an interesting juxtaposition of high precision vs VERY low precision. It will be nice to have the low end support, though they are very listenable without a sub.

FUN FACT: these are the only speakers I have ever made that are partially painted with my blood splinters...

Nice. How about using a suprabaffle - Oval shaped like the ones used By Bob Brines ?
Of course, the acoustic loading at the back should be studied, like chamfering and not obtruding the air flow ( first early reflections that impact on mid-high range )...

Just something I have been playing with for the last year. It's a DIY full range 6” unit, the plan is that it shall bee used fro 80Hz and op. This has been the best project that I have been working with in years, and the most challenged by far. Here is some pictures.

Just something I have been playing with for the last year. It's a DIY full range 6” unit, the plan is that it shall bee used fro 80Hz and op. This has been the best project that I have been working with in years, and the most challenged by far. Here is some pictures.

Take care

¿Is it a field-coil speaker? I have always wished to do something like that, but as you say it is extremely challenging. Looks promising...